Evaluation of uncorrelation and statistics inside a reverberation chamber in presence of two independent stirrers

The paper analyzes the stirrer performances in a reverberation chamber (RC). The independent positions (N) of the stirrers are computed when one or two stirrers rotate inside the chamber. In the case of two operating stirrers, they are moved in both synchronized and interleaved tuned modes showing that this second modality yields a larger independent position number. In the case of one stirrer and two synchronized stirrers, the independent positions are computed using the classical autocorrelation function, whereas in the case of two completely independent stirrers a two dimensional autocorrelation is proposed. It is shown that this procedure does not depend on the order followed to move the stirrers. The stirrer performances are also verified checking the ratio between the maximum and the averaged received power inside the chamber. Finally, the statistics of the received power analyzed applying the severe Anderson Darlington (AD) test to discover the departure from the expected distribution.